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Async (JavaScript)
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let gitHubApi = 'https://api.github.com/users/JV-Amorim/repos'; | |
// A) Usando a biblioteca Request (ultrapassada): | |
/* | |
const request = require('request'); | |
request(gitHubApi, { headers: { 'User-Agent': 'node.js' } }, (err, res, body) => { | |
console.log(JSON.parse(body)); | |
}); | |
*/ | |
// B) Usando a biblioteca Axios com promise: | |
/* | |
const axios = require('axios'); | |
axios.get(gitHubApi).then(res => { | |
console.log(res.data); | |
}); | |
*/ | |
// C) Usando a biblioteca Axios com async/await: | |
/* | |
const axios = require('axios'); | |
// Técnica IIFE (declarar uma função já executando-a): | |
(async () => { | |
const res = await axios.get(gitHubApi); | |
console.log(res.data); | |
})(); | |
*/ | |
// C.1) O código abaixo gera baixa performance, já que cada operação | |
// assíncrona aguarda a superior finalizar, mesmo sem necessidade: | |
/* | |
const axios = require('axios'); | |
gitHubApi = user => `https://api.github.com/users/${user}/repos`; | |
(async () => { | |
console.time() | |
await axios.get(gitHubApi('JV-Amorim')); | |
await axios.get(gitHubApi('torvalds')); | |
await axios.get(gitHubApi('akitaonrails')); | |
console.timeEnd() | |
})(); | |
*/ | |
// C.2) O problema do C.1 pode ser facilmente solucionado com o Promise.all: | |
const axios = require('axios'); | |
gitHubApi = user => `https://api.github.com/users/${user}/repos`; | |
(async () => { | |
console.time() | |
const p1 = axios.get(gitHubApi('JV-Amorim')); | |
const p2 = axios.get(gitHubApi('torvalds')); | |
const p3 = axios.get(gitHubApi('akitaonrails')); | |
await (Promise.all([p1, p2, p3])); | |
console.timeEnd() | |
})(); | |
// --- | |
console.log('Teste'); |
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